Title:
TRANSMITTER-RECEIVER
Document Type and Number:
Japanese Patent JP3652562
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the cost of a transmitter-receiver by reducing the number of parts to be used for antenna switching and to reduce the size of the transmitter-receiver by reducing the space of a printed board constituting a receiving circuit and a transmission circuit.
SOLUTION: The transmitter-receiver is provided with an antenna 1, a transmission circuit 4, a receiving circuit 5, a 1st transmission line 2 for connecting the circuit 4 to the antenna 1, and a 2nd transmission line 3 for connecting the circuit 5 to the antenna 1. In the constitution, the length of the 1st transmission line 2 is set to almost 1/4 the wavelength of transmission frequency and the length of the 2nd transmission line 3 is set to almost 1/4 the wavelength of receiving frequency.
Inventors:
Sugano Susumu
Application Number:
JP28966199A
Publication Date:
May 25, 2005
Filing Date:
October 12, 1999
Export Citation:
Assignee:
ALPS ELECTRIC CO.,LTD.
International Classes:
H01P1/213; H01Q1/38; H01Q9/16; H04B1/44; (IPC1-7): H04B1/44
Domestic Patent References:
| JP63042201A | ||||
| JP60174534A | ||||
| JP10270914A | ||||
| JP9093015A | ||||
| JP7074672A | ||||
| JP4263502A | ||||
| JP3258126A | ||||
| JP3244202A | ||||
| JP2095001A | ||||
| JP58050750U |